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Features

Improved Adjustable-Jaw Vise

On the Theory of the Luminosity of Flames

Explosive Compounds for Engineering Purposes

Progress of the Velocipede

Obituary-Luther Atwood

Small-Pox and Vaccination

Gross' Patent Combined Letter Opener

Write Legibly and Intelligently

The Preservation of Timber

The Scientist, Inventor, and Mechanic

Ventilation in Buildings

The Natural Highways of Travel

Beet Root Sugar

Taste and Smell—A New Theory

Manufacturing, Mining, and Railroad Items

Editorial Summary

Applications for the Extension of Patents

New Publications

Recent American and Foreign Patents

Official List of Patents

Issued by the United States Patent Office

Patent Offices

European Patents

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April 10, 1869

Beyond XX and XY

Biology. Identity. Equality.